Add an isPrivate flag to EmittedArtifact.
Private resources are emitted into a module's auxiliary directory.
Track the Generator that created a GeneratedResource.
Update i18n Generator to use private artifacts.
Removes no-deploy/ partial path treatments from generated resources.

Patch by: bobv, jat (i18n)
Review by: jat, bruce


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@2276 8db76d5a-ed1c-0410-87a9-c151d255dfc7